Quantum-enhanced interferometry with weak thermal light

Seyed Mohammad Hashemi Rafsanjani, Mohammad Mirhosseini, Omar S. Magaña-Loaiza, Bryan T. Gard, Richard Birrittella, B. E. Koltenbah, C. G. Parazzoli, Barbara A. Capron, Christopher C. Gerry, Jonathan P. Dowling, Robert W. Boyd

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


We propose and implement a procedure for enhancing the sensitivity with which one can determine the phase shift experienced by a thermal light beam possessing on average fewer than four photons in passing through an interferometer. Our procedure entails subtracting exactly one (which can be generalized to m) photon from the light field exiting an interferometer containing a phase-shifting element in one of its arms. As a consequence of the process of photon subtraction, the mean photon number and signal-to-noise ratio (SNR) of the resulting light field are increased, leading to an enhancement of the SNR of the interferometric signal for that fraction of the incoming data that leads to photon subtraction.

Original languageEnglish (US)
Pages (from-to)487-491
Number of pages5
Issue number4
StatePublished - Apr 20 2017
Externally publishedYes


  • Interferometry
  • Metrology
  • Photon statistics
  • Quantum optics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics


Dive into the research topics of 'Quantum-enhanced interferometry with weak thermal light'. Together they form a unique fingerprint.

Cite this